Invalid response JSON when response is null

[jonathanl-telenav]

Description

When the response object is null the response is invalid:

{
,
"error": []
}

[jonathanl-telenav]

I don't have an easy test case for this, but checking for an empty payload like this should fix it:

                        writeResponse("{");
                        var payload = stripBrackets(toJson(response));
                        if (!payload.isEmpty())
                        {
                            writeResponse(payload + ",");
                        }
                        writeResponse(stripBrackets(toJson(errors)));
                        writeResponse("}");

[jonathanl-telenav]

fixed in https://github.com/Telenav/kivakit-extensions/pull/43